Low pressure/high temperature metamorphism of Koettlitz Group schists, Taylor Valley and upper Ferrar Glacier area, South Victoria Land, Antarctica
Low pressure/high temperature metamorphism of Koettlitz Group schists, Taylor Valley and upper Ferrar Glacier area, South Victoria Land, Antarctica
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南极洲南维多利亚州泰勒谷和上费拉尔冰川地区科特利茨群片岩的低压/高温变质作用
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发表时间：
1992
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通讯作者：
A. Allibone
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作者：
A. Allibone
摘要 泰勒谷和费拉尔冰川上部地区的 Koettlitz 群变沉积岩含有罕见的含石榴石层和泥质片岩，合计占裸露露头的 2%。含有上部角闪岩相组合石英-硅线石-堇青石-黑云母-石榴石-钾长石-残红柱石的泥质片岩仅限于泰勒谷下游的峡谷。在泰勒谷上游，白云母-钾长石-石英-斜长石-黑云母组合出现在深熔混合岩和石英-钾-长石-石榴石-黑云母-斜长石组合附近，其中一个样品含有硅线石作为石榴石中的包裹体。在达科夫斯基和费拉尔冰川交汇处，石英-黑云母-斜长石-石榴石片岩含有稀有的石英-斜长石-堇青石隐色体。相关系表明，整个泰勒谷和费拉尔冰川上部区域的峰值变质温度和压力为 700 ± 50°C 和 4-5 kbar。样品 56816 中存在残余红柱石表明...
Abstract Koettlitz Group metasediments of the Taylor Valley and upper Ferrar Glacier region contain rare horizons of garnet‐bearing and pelitic schist, together comprising 2% of the exposed outcrop. Pelitic schists containing the upper amphibolite facies assemblage quartz‐sillimanite‐cordierite‐biotite‐garnet‐K‐feldspar‐relict andalusite are restricted to The Defile in the lower Taylor Valley. In the upper Taylor Valley, muscovite‐K‐feldspar‐quartz‐plagioclase‐biotite assemblages occur adjacent to anatectic migmatites and quartz‐K‐feldspar‐garnet‐biotite‐plagioclase assemblages, with one sample containing sillimanite as inclusions in garnet At the confluence of the Darkowski and Ferrar Glaciers, quartz‐biotite‐plagioclase‐garnet schists contain rare quartz‐plagioclase‐cordierite leucosomes. Phase relations indicate peak metamorphic temperatures and pressures of 700 ± 50°C and 4–5 kbars throughout the Taylor Valley and upper Ferrar Glacier area. The presence of relict andalusite in sample 56816 suggests a ...